n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 36 |
3 | 308 |
4 | 2764 |
5 | 25404 |
6 | 237164 |
7 | 2237948 |
8 | 21286548 |
9 | 203701772 |
10 | 1958748676 |
11 | 18908954324 |
12 | 183135542956 |
13 | 1778581016076 |
14 | 17314029758828 |
15 | 168891863875652 |
[1,4,36,308,2764,25404,237164,2237948,21286548, 203701772,1958748676,18908954324,183135542956, 1778581016076,17314029758828,168891863875652] |